Page Types Within a Table Extent

Within the extent, individual pages contain different
types of data. Extent pages for a table can be separated into the
following categories:

Data pages

Data pages contain the data rows for the table.

Bitmap pages

Bitmap pages contain control information that
monitors the fullness of every page in the extent.

Blobpages

Blobpages contain TEXT and BYTE data that is stored
with the data rows in the dbspace. TEXT and BYTE data that resides
in a blobspace is stored in blobpages, a structure that is completely
different than the structure of a dbspace blobpage.

Free pages

Free pages are pages in the extent that are allocated
for tblspace use, but whose function has not yet been defined. Free
pages can be used to store any kind of information: data, including
TEXT or BYTE data types; index; or bitmap.

Figure 1 illustrates the possible
structure of a nonfragmented table with an initial-extent size of
8 pages and a next-extent size of 16 pages.